Secondary fuse-block.



A. F. SPROUL.

SECONDARY FUSE BLOCK.

APPUCATION man mule. m1.

1,262,861 Patented Apr. 16.1918.

g \g x i2 J 6 a "4 J v mmug :FF IT- la lNVENTOR WiTNESSEIS ATTORNEYtaken on the line 44 of Fig. 3

UNITED STATES PATENT OFFICE.

ANDREW r. SPBOUL, or OAKLAND, carirroama.

sncommar Fuss-stock.

Specification of Letters Patent.

Application filed January 29, 1917. Serial 1,262,861. Patented Apr. 16,1918.

Hal-15,194.

ers as 11 are mounted on these screws between the heads thereof and theopposed outer faces of the castings, and are adapted for clamping theends of a fuse link L which electrically connects the two castings,

To all whom it may concern c it known that 1, ANDREW F. SPROUL, acitizen of the United States, residing at Oakland, in the county ofAlameda and State of California, have invented certain new and usefulImprovements in Secondary Fuse-Blocks, of which the following is aspecification.

his invention relates to improvements in temperature. I secondary fuseblocks for holding a standard Th's improved fuseblock is designed forlin fuse. 1 i

The object of the invention is to provide a simply and cheaplyconstructed device ofthis character which is positive in action and maybe easily repaired; t

Thisinvcntion consists in matters hereinafter set forth and moreparticularly pointed out in the appended claims.

In the accompanying drawings Figure 1 represents a side elevation of afuse block constructed in accordance with this invention,

ig. 2 represents a top plan view thereof,

ig. 3 is a, longitudinal central section taken on the line 33 of Fig. 2,

Fig. 4 is a transverse vertical section From the above description itwill be obvious that this device is simple in construction and efiicientin operation, and by using the link fuse L in connection therewith willfully protect a transformer.

In the embodiment illustrated this im- From the foregoing description,taken in proved device comprises two tubular contacts 1 and 2 preferablycomposed of brass th castings, the outer ends of the bores 3 being th ofsmaller diameter than those of the inner ends and are designed toreceive the conducting wires WV, which latter are held in engagementwith said castings by set screws he enlarged inner ends of the bores ofhat such changes may be made as are with- In the scope of the claimedinvention. I claim as my invention pair of tubular castings ofconductive material, a eonnectin and spacing core pf insulatingmaterialiaving its ends disposed in the opposed ends of Bald castingswhereby and operate to hold the castsaid apart, screws exrelation.

he ends of the core 6 have threaded apertures 8 extending transverselytherethrough and are designed to receive screws 9 which pass throughopenings o .the castings 1 and 2, and through the apertures 8 in saidcore thereby securely 2.

In a device of the class described, a connecting the castmgs to thecore. Washthe bore of each ings and through said being larger at oneend. than at the other; a connecting, and spacing core of insulatingmaterial having its ends disposed in the larger bore ends of saidcastings, screws extending transversely through one wall of the largerbore ends of the castings and through said spacing member, and wiresecuring screws extending transversely through one wall of small boreends of said castings.

3. In a device of the class described, a pair of tubular castings ofconductive material, the bore of each being larger at one end than atthe other with a shoulder at the meeting ends of said larger and smallerbore ortions, a connecting and spacing core of insulating materialhaving its ends disposed in thelarger bore ends of said castings and ofa. length greater than the combined length of the larger bore ends ofthe two castings whereby said castings are spaced apart, screwsextending transversel through one wall of the larger bore ends 0 thecastspacing member thereby connecting said castings and memher, and Wiresecuring screws extending transversely through one wall of the smallbore ends of said castings.

4. A fuse block of he class described comprising two tubular brasscastings, the here of each of which is smaller at one end than at theother. a shoulder formed at the meeting ends of the larger and smallerbore )ortions of each casting, the screws extendmg through one wall ofthe larger bore end of each casting and having a washer thereon outsideof said casting, a connector for said castings composed of insulatingmaterial having the ends thereof disposed in the larger bore ends of thecastings and pro- \ided with transversely extending passagescommunicating with the apertures in said castings when in operativeposition to ree '\'c said screws, said connector having longitudinallyspaced shoulders abutting the outer ends of the castings when inoperative position for limiting the insertion of said connector in saidcastings, and set screws for connecting the wires of the electriccircuit with the smaller bore ends of said castlit testimony whereof Iafiix my signature in presence of two witnesses.

ANDREW F. SPROUL. Witnesses:

Cnanuzs W. LOVELL, J r., JAMES M. ALLUS.

